Hi Barry, I don't understand why but -log_summary does not produce anything. I've checked that the code has been compiled with DPETSC_USE_LOG.
Any tips ? Thanks, Etienne -----Message d'origine----- De?: owner-petsc-users at mcs.anl.gov [mailto:owner-petsc-users at mcs.anl.gov] De la part de Barry Smith Envoy??: vendredi 6 juin 2008 16:39 ??: petsc-users at mcs.anl.gov Objet?: Re: KSPCR with PCILU generally slower with v2.3.3 than with 2.3.0 If you run both cases with -log_summary you'll see where it is spending more time. Mail along the -log_summary output. Barry On Jun 6, 2008, at 6:27 AM, Etienne PERCHAT wrote: > Hi Barry, > > Using -ksp_truemonitor does not change anything. I have the same > number of iterations in the 3 cases (v2.3.3p8 + true_monitor, > v2.3.3, v2.3.0) and the same final residual norm but with v2.3.0 the > code is slightly faster. > > I have to stress that I also monitor convergence with KSPMonitorSet > in order to store the "best residual" and the "best solution" (I did > not test if it is still useful in 2.3.3). > > Etienne > > -----Message d'origine----- > De : owner-petsc-users at mcs.anl.gov [mailto:owner-petsc-users at > mcs.anl.gov > ] De la part de Barry Smith > Envoy? : jeudi 5 juin 2008 20:28 > ? : petsc-users at mcs.anl.gov > Objet : Re: KSPCR with PCILU generally slower with v2.3.3 than with > 2.3.0 > > > This could also be the result of changes in the way we test for > convergence. > Try with -ksp_truemonitor and see if it is using the same number of > iterations > to converge. > > Barry > > On Jun 5, 2008, at 5:35 AM, Etienne PERCHAT wrote: > >> Hello, >> >> I'm solving MPIBAIJI matrices using KSPCR preconditioned by a >> PCBJACOBI >> between sub domains and PCILU with a fill ratio of 1 on each sub >> domain. >> >> Solving exactly the same linear systems, I notice that the solution >> is >> slower using v2.3.3p8 than with v2.3.0. >> The behavior is not very clear: v2.3.3p8 is generally slower (10 % or >> more) but on some systems it happen to be really faster (may be 40 >> %). >> >> Unhappily in my case at the end I'm always slower ... >> >> Did somebody noticed such behavior? Is there changes if I upgrade to >> current 2.3.3p13 version (I've seen a fix:" fix error with using >> mpirowbs & icc & ksp_view") ? >> >> Thanks, >> Etienne Perchat >> >> > > >
